﻿#region rights

// 
// pushbomb software engineering
//  Composite Standard Practice Sample App for Silverlight
//     an evolving discussion and concrete delivery architecture
//  
// Microsoft Public License (Ms-PL)
// 
// This license governs use of the accompanying software. If you use the software, you accept this license. If you do not accept the license, do not use the software.
// 
// 1. Definitions
// 
// The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning here as under U.S. copyright law.
// 
// A "contribution" is the original software, or any additions or changes to the software.
// 
// A "contributor" is any person that distributes its contribution under this license.
// 
// "Licensed patents" are a contributor's patent claims that read directly on its contribution.
// 
// 2. Grant of Rights
// 
// (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution or any derivative works that you create.
// 
// (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution in the software or derivative works of the contribution in the software.
// 
// 3. Conditions and Limitations
// 
// (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
// 
// (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your patent license from such contributor to the software ends automatically.
// 
// (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution notices that are present in the software.
// 
// (D) If you distribute any portion of the software in source code form, you may do so only under this license by including a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or object code form, you may only do so under a license that complies with this license.
// 
// (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a particular purpose and non-infringement.

#endregion

#region

using System.Collections.Generic;
using System.Reflection;
using Microsoft.Practices.ObjectBuilder2;
using Microsoft.Practices.Unity.Utility;

#endregion

namespace Microsoft.Practices.Unity.ObjectBuilder
{
    /// <summary>
    /// A <see cref="IMethodSelectorPolicy"/> implementation that calls the specific
    /// methods with the given parameters.
    /// </summary>
    public class SpecifiedMethodsSelectorPolicy : IMethodSelectorPolicy
    {
        private readonly List<Pair<MethodInfo, IEnumerable<InjectionParameterValue>>> methods =
            new List<Pair<MethodInfo, IEnumerable<InjectionParameterValue>>>();

        #region IMethodSelectorPolicy Members

        /// <summary>
        /// Return the sequence of methods to call while building the target object.
        /// </summary>
        /// <param name="context">Current build context.</param>
        /// <returns>Sequence of methods to call.</returns>
        public IEnumerable<SelectedMethod> SelectMethods(IBuilderContext context)
        {
            foreach (var method in methods)
            {
                var typeToBuild = BuildKey.GetType(context.BuildKey);
                SelectedMethod selectedMethod;
                var typeReflector = new ReflectionHelper(method.First.DeclaringType);
                var methodReflector = new MethodReflectionHelper(method.First);
                if (!methodReflector.MethodHasOpenGenericParameters && !typeReflector.IsOpenGeneric)
                {
                    selectedMethod = new SelectedMethod(method.First);
                }
                else
                {
                    var closedMethodParameterTypes =
                        methodReflector.GetClosedParameterTypes(typeToBuild.GetGenericArguments());
                    selectedMethod = new SelectedMethod(
                        typeToBuild.GetMethod(method.First.Name, closedMethodParameterTypes));
                }
                SpecifiedMemberSelectorHelper.AddParameterResolvers(
                    typeToBuild,
                    context.PersistentPolicies,
                    method.Second,
                    selectedMethod);
                yield return selectedMethod;
            }
        }

        #endregion

        /// <summary>
        /// Add the given method and parameter collection to the list of methods
        /// that will be returned when the selector's <see cref="IMethodSelectorPolicy.SelectMethods"/>
        /// method is called.
        /// </summary>
        /// <param name="method">Method to call.</param>
        /// <param name="parameters">sequence of <see cref="InjectionParameterValue"/> objects
        /// that describe how to create the method parameter values.</param>
        public void AddMethodAndParameters(MethodInfo method, IEnumerable<InjectionParameterValue> parameters)
        {
            methods.Add(Pair.Make(method, parameters));
        }
    }
}